[S390] qdio: new qdio driver.

List of major changes:
- split qdio driver into several files
- seperation of thin interrupt code
- improved handling for multiple thin interrupt devices
- inbound and outbound processing now always runs in tasklet context
- significant less tasklet schedules per interrupt needed
- merged qebsm with non-qebsm handling
- cleanup qdio interface and added kerneldoc
- coding style

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com>
Reviewed-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

4 files changed, 19 insertions, 42 deletions

diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index 36169c6944f..fca48b88fc5 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -297,15 +297,13 @@ void zfcp_hba_dbf_event_fsf_unsol(const char *tag, struct zfcp_adapter *adapter,
 /**
  * zfcp_hba_dbf_event_qdio - trace event for QDIO related failure
  * @adapter: adapter affected by this QDIO related event
- * @status: as passed by qdio module
  * @qdio_error: as passed by qdio module
- * @siga_error: as passed by qdio module
  * @sbal_index: first buffer with error condition, as passed by qdio module
  * @sbal_count: number of buffers affected, as passed by qdio module
  */
-void zfcp_hba_dbf_event_qdio(struct zfcp_adapter *adapter, unsigned int status,
-			     unsigned int qdio_error, unsigned int siga_error,
-			     int sbal_index, int sbal_count)
+void zfcp_hba_dbf_event_qdio(struct zfcp_adapter *adapter,
+			     unsigned int qdio_error, int sbal_index,
+			     int sbal_count)
 {
 	struct zfcp_hba_dbf_record *r = &adapter->hba_dbf_buf;
 	unsigned long flags;
@@ -313,9 +311,7 @@ void zfcp_hba_dbf_event_qdio(struct zfcp_adapter *adapter, unsigned int status,
 	spin_lock_irqsave(&adapter->hba_dbf_lock, flags);
 	memset(r, 0, sizeof(*r));
 	strncpy(r->tag, "qdio", ZFCP_DBF_TAG_SIZE);
-	r->u.qdio.status = status;
 	r->u.qdio.qdio_error = qdio_error;
-	r->u.qdio.siga_error = siga_error;
 	r->u.qdio.sbal_index = sbal_index;
 	r->u.qdio.sbal_count = sbal_count;
 	debug_event(adapter->hba_dbf, 0, r, sizeof(*r));
@@ -398,9 +394,7 @@ static void zfcp_hba_dbf_view_status(char **p,
 
 static void zfcp_hba_dbf_view_qdio(char **p, struct zfcp_hba_dbf_record_qdio *r)
 {
-	zfcp_dbf_out(p, "status", "0x%08x", r->status);
 	zfcp_dbf_out(p, "qdio_error", "0x%08x", r->qdio_error);
-	zfcp_dbf_out(p, "siga_error", "0x%08x", r->siga_error);
 	zfcp_dbf_out(p, "sbal_index", "0x%02x", r->sbal_index);
 	zfcp_dbf_out(p, "sbal_count", "0x%02x", r->sbal_count);
 }
diff --git a/drivers/s390/scsi/zfcp_dbf.h b/drivers/s390/scsi/zfcp_dbf.h
index d04aea60497..0ddb18449d1 100644
--- a/drivers/s390/scsi/zfcp_dbf.h
+++ b/drivers/s390/scsi/zfcp_dbf.h
@@ -139,9 +139,7 @@ struct zfcp_hba_dbf_record_status {
 } __attribute__ ((packed));
 
 struct zfcp_hba_dbf_record_qdio {
-	u32 status;
 	u32 qdio_error;
-	u32 siga_error;
 	u8 sbal_index;
 	u8 sbal_count;
 } __attribute__ ((packed));
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 8065b2b224b..edfdb21591f 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -48,9 +48,8 @@ extern void zfcp_rec_dbf_event_action(u8, struct zfcp_erp_action *);
 extern void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *);
 extern void zfcp_hba_dbf_event_fsf_unsol(const char *, struct zfcp_adapter *,
 					 struct fsf_status_read_buffer *);
-extern void zfcp_hba_dbf_event_qdio(struct zfcp_adapter *,
-				    unsigned int, unsigned int, unsigned int,
-				    int, int);
+extern void zfcp_hba_dbf_event_qdio(struct zfcp_adapter *, unsigned int, int,
+				    int);
 extern void zfcp_san_dbf_event_ct_request(struct zfcp_fsf_req *);
 extern void zfcp_san_dbf_event_ct_response(struct zfcp_fsf_req *);
 extern void zfcp_san_dbf_event_els_request(struct zfcp_fsf_req *);
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 72e3094796d..d6dbd653fde 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -74,17 +74,15 @@ static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
 	}
 }
 
-static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int status,
-			      unsigned int qdio_err, unsigned int siga_err,
-			      unsigned int queue_no, int first, int count,
+static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
+			      int queue_no, int first, int count,
 			      unsigned long parm)
 {
 	struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
 	struct zfcp_qdio_queue *queue = &adapter->req_q;
 
-	if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
-		zfcp_hba_dbf_event_qdio(adapter, status, qdio_err, siga_err,
-					first, count);
+	if (unlikely(qdio_err)) {
+		zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
 		zfcp_qdio_handler_error(adapter, 140);
 		return;
 	}
@@ -129,8 +127,7 @@ static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
 
 	count = atomic_read(&queue->count) + processed;
 
-	retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
-			 0, start, count, NULL);
+	retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT, 0, start, count);
 
 	if (unlikely(retval)) {
 		atomic_set(&queue->count, count);
@@ -142,9 +139,8 @@ static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
 	}
 }
 
-static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int status,
-			       unsigned int qdio_err, unsigned int siga_err,
-			       unsigned int queue_no, int first, int count,
+static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
+			       int queue_no, int first, int count,
 			       unsigned long parm)
 {
 	struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
@@ -152,9 +148,8 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int status,
 	volatile struct qdio_buffer_element *sbale;
 	int sbal_idx, sbale_idx, sbal_no;
 
-	if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
-		zfcp_hba_dbf_event_qdio(adapter, status, qdio_err, siga_err,
-					first, count);
+	if (unlikely(qdio_err)) {
+		zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
 		zfcp_qdio_handler_error(adapter, 147);
 		return;
 	}
@@ -362,7 +357,7 @@ int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
 	}
 
 	retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first,
-			 count, NULL);
+			 count);
 	if (unlikely(retval)) {
 		zfcp_qdio_zero_sbals(req_q->sbal, first, count);
 		return retval;
@@ -400,10 +395,6 @@ int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
 	init_data->qib_param_field = NULL;
 	init_data->input_slib_elements = NULL;
 	init_data->output_slib_elements = NULL;
-	init_data->min_input_threshold = 1;
-	init_data->max_input_threshold = 5000;
-	init_data->min_output_threshold = 1;
-	init_data->max_output_threshold = 1000;
 	init_data->no_input_qs = 1;
 	init_data->no_output_qs = 1;
 	init_data->input_handler = zfcp_qdio_int_resp;
@@ -436,9 +427,7 @@ void zfcp_qdio_close(struct zfcp_adapter *adapter)
 	atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
 	spin_unlock(&req_q->lock);
 
-	while (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)
-			== -EINPROGRESS)
-		ssleep(1);
+	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
 
 	/* cleanup used outbound sbals */
 	count = atomic_read(&req_q->count);
@@ -473,7 +462,7 @@ int zfcp_qdio_open(struct zfcp_adapter *adapter)
 		return -EIO;
 	}
 
-	if (qdio_activate(adapter->ccw_device, 0)) {
+	if (qdio_activate(adapter->ccw_device)) {
 		dev_err(&adapter->ccw_device->dev,
 			 "Activate of QDIO queues failed.\n");
 		goto failed_qdio;
@@ -487,7 +476,7 @@ int zfcp_qdio_open(struct zfcp_adapter *adapter)
 	}
 
 	if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0,
-		     QDIO_MAX_BUFFERS_PER_Q, NULL)) {
+		     QDIO_MAX_BUFFERS_PER_Q)) {
 		dev_err(&adapter->ccw_device->dev,
 			 "Init of QDIO response queue failed.\n");
 		goto failed_qdio;
@@ -501,9 +490,6 @@ int zfcp_qdio_open(struct zfcp_adapter *adapter)
 	return 0;
 
 failed_qdio:
-	while (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)
-			== -EINPROGRESS)
-		ssleep(1);
-
+	qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR);
 	return -EIO;
 }